Corporated



- ammi' Junie 18, 1929. I I 'w. E. EWILLIAMS 1,717,864

DUPLICK'IfNG" MACHINE ON THE HECTOGRAPH PRINCIPLE June 8, .9- w. E. WILLIAMS 1.717.864

I DUPLICATINGMAGHINE on THE rmc'roemp u PRINCIPLE Filed March 192a SSheets-Shet 2 June 18, 1929. w. E. WILLIAMS DURLICATING MACHINE ON THE HECTOGRAPH PRINCIPLE Filed March 3, 1928 3 Sheets-Sheet 3 ,1 I s \V I x 2 1 k I I .1 .7. I I P Patented June 18, 1929.

UNITED STATES PATENT OFFICE.

WILLIAM ERASTUS WILLIAMS, OF WILMETTE, ILLINOIS, ASSIGNOR TO DI'ITO, IN-

CORPORATED, OF CHICAGO, ILLINOIS, A CORPORATION OF WEST VIRGINIA.

DUPLICATING MACHINE ON THE HECTOGRAIH PRINCIPLE.

Application filed March 3,

My invention relates to those machines wherein a sheet of gelatinized paper or fabric is stretched from one reel onto another over an intervening bed and copies made from this sheet on the hectograph principle by means of a rubber-faced platen roll mounted in a carriage which is mounted on the frame of the machine and adapted to be moved backward and forward in impressing paper by means of a platen roll onto the gelatin pad sheet and withdrawing the same on the return movement of the carriage.

The object of my invention is to provide a new and eflicient means for preventing the rotary movement of the platen roll as the same is raised and lowered in impressing paper onto the gelatin pad.

In machines of this class it is necessary to have the-paper register on the gelatin pad exactly in the same position the master copy was placed down of which'duplicate copies are made in order that the duplicate copies shall conform to the same blank spaces of the blanks used in the master copy.

My invention relates to this registering feature of the copies as relates to the first lay down of the master copy.

My invention is shown as an improvement in details over the machine which is more or less in general use and therefore only so much of the machine is shown as is necessary to convey the information in relation to this particular invention.

Reference will be had to the accompanying drawings in which Fig. 1 is asectional elevation of the part of the machine at the front end of the machine on line 11 of Fig. 4 with the platen roll down in contact in placing the paper onto the gelatine pad.

Fig. 2 is a similar view to that of Fig. 1 but with the platen roll in raised position.

Fig. 3 is a'view similar to Figs. 1 and 2 but with the platen roll down looking in the reverse direction from that of Figs. 1 and 2 on line 3-3 of Fig. 4.

Fig. 4 is a plan view at the right near front end of the machine showing only the parts that are involved in this invention.

Fig. 5 is an elevational view similar to Figs. 1 and 2 on same line as Fig. 1 but showing the impression carriage moving forward in the act of laying the paper onto the gelatin pad or withdrawing the same as the case may be as the position of the parts would be the same as relates to Fig. 5 if the 1928. Serial No, 258,836.

carria e is moving to the right or home to the left of Fig. 5.

Fig. 6 is a plan sectional View on line 6-6 of Fig. 1 showing the position of the parts when the carriage is home and the home position being shown in Figs. 1 and 2.

F ig. 7 is a plan section similar to that of Fig. 6 but with the position of the carriage substantially that of what is shown in Fig. 5, on line 7- -7 of Fig. 5.

The machine in general use is composed primarily of side frame members, the right frame member 1 only being shown in this drawing and connected across by a metal bed member 2 over which is stretched the impression bed pad of felt 3 and over this there is the gelatine or hectograph pad 4 which is trained down to and wound upon spindles at each end of the bed, only one of which spindles is indicated by dotted line 5 in Fig. 5.

Extending across at the end of the bed there is what is called a standard margin bar 6 composed of an angle shaped bar connected by links 7 to hinge pins 8 on the bed of the machine. A guiding and supporting bar for a movable carriage is indicated by 9 fixed at each end of the machine by brackets 10 (see Fig. 4) and sliding on this bar 9 there is a'block 11 to which is fixed by pins 12 the carriage frame 13 of a carriage which I term the impressioncarriage and this carriage is provided with an inclined plate 14 and end flanges 15 which acts as a paper guide to-direct the paper 45 into the margin bar 6 whenever the carriage is home and in the position of Fig. 2. A side paper guide (not shown) having a side flange similar to flange 15 is adjustable along the edge of the paper guide for the lateral sidewiseadjustment of the paper, Mounted in the carriage 13 there is a yoke 16 hinged at 17 into end members of the carriage 13 and to this yoke is fixed handle 18 by which the operator works the carriage. The yoke 16 is provided with arms 19 at each end in which there is mounted the shaft 20 of a rubber-faced roll 21 which is the platen or impression roll of the machine. A compression roll 22 is ournaled at its end in little blocks 23 hinged at 24 into the end members of the impression carriage and these rollers are automatically pressed toward the platen or impression roller 21 by means of little springs 25, at each block 23. A pin 26 (see Fig. 3) abuts against a shoulder 27 and prevents the compression roller being pushed too far toward the platen roller 21.

As the paper 45 is inserted into and up against the margin bar 6 when the carriage is in the position of Fig. 2 then as the handle 18 is moved downward, bringing the platen roll 21 first against the paper 45 and pushing it in contact with the compression roll 22, the platen roller 21 pushes the compression roll backward compressing the springs and in this action the contact with and pass ing of the compression roll 22 would cause, if not prevented, the platen roll 21 torevolve slightly in'reverse clockwise direction as appears in Figs. 1 and 2 and this action would draw the sheet of paper slightly away from snug contact with the margin bar (3 and this variation or drawing away from the margin bar 6 would vary according to the thickness or stiffness of the paper and it is necessary to prevent this revolution of the platen roll 21 as it presses down the paper to contact with the impression or gelatin pad and in the means for preventing this revolution of the platen roll there is the mechanism which I now describe, namely Upon the shaft 20 of the impression roll 21 there is mounted a rather large disk 28. The diameter of this disk is large enough to extend out slightly beyond the hinge pin center 17 of the yoke 16 and directly in line with this hinge pin shaft 17 on the outside of the disk 28 there is a small disk 29 form ing a part of a brake for the disk 28 (see Figs. 4, 6 and 7 This small disk 29 revolves on a pin 30 and is held in a little bracket 31 fixed by screws 32 to the impression carriage frame 13. On the inside of the disk 28 there is a companion braking block 33 mounted directly in line with the hinge shaft 17 upon a ball-'and-socket joint 34 (see Figs. 6 and 7) of a pin 35 in abell crank block 36 hinged at 37 in a top bracket 38 and a lower bracket 39 which brackets are secured to thecarriage frame 13 (see Figs. 1, 6'and 7 The bell crank block 36 is provided with a peculiarly shaped downward leg 40 (see Fig, 2 having an outward extending projection 41 adapted to be engaged by a spring 42 fixed to a bracket block 43 in the side frame 1 of the machine (see Fig. 5.) and the spring 42 is adjustable for tension by the screw 44. Thus, when the carriage is brought home to the position of Figs. 1, 2, 3, 4, and 6, the arm 41 is engaged by a spring 42 and moves, the bell crank block 36 to bring the brake block 33 in contact with the disk 28 and thus force the disk against the brake disk block 29 and thus hold the shaft 20 of the impression roll 21 from revolving at all so long as the carriage is held home and during the insertion and removal of the paper and its first contact or impression with the gelatin pad and thus this braking mechanism prevents displacements of the registry of any sheet of paper 45 by accidental revolution of the platen roller 21 in the movement downward in clamping the paper onto the gelatin.

' However, the first movement forward of the carriage in laying down the paper on the gelatin being the first movement away from the home place and away from the margin bar 6, the arm 14 becomes free from contact with the spring 42 and thus releases the brake blocks 33 and 29 from the disk 28 and thus permits a perfectly free movement of the platen roll 21 in laying down the paper and withdrawing same from the gelatin pad.

Thus by this brake mechanism arranged as described, a perfect registration of the paper is always obtained in contact with the margin bar as the paper is applied either as to the master copy or its duplicates which are thereafter taken from the gelatin pad.

The arrangement of this braking device owing to the fact that the braking members are directly in line with the hinge shaft 17 of the yoke 16 allows the impression roller 21 to be raised and lowered by the yoke with no revolving movement whatever of the disk on its own shaft. The little brake blocks 33 and 29 revolving slightly on their pin centers which pin centers are exactly in line with the hinge shaft 17.

lVhat I claim is r V 1. In a machine of the class described, a platen roller mounted in a yoke and the said yoke hinged in a carriage and adapted to be raised and lowered in the function of applying paper to and removing it from a gelatin pad, a disk mounted on the shaft of the said platen roller and having a diameter extending to the region of the line of the hinge pin axis of the said yoke and with braking means adapted to clamp the said disk in the region of the said hinge pin axis of the said yoke.

2. In a machine of the class described, a bed, a carriage mounted to move backward and forward over the said bed, a yoke hinged in the said carriage, a platen roll mounted in the said yoke and adapted to be raised and lowered in relation to the said bed, a braking means located in the region of the axis of the hinge'of the said yoke and a disk mounted on theshaft of the said platen roll the diameter of which extends to theregion of the said axis of the said yoke, a means foractuating the said braking means'fixed to the frame of the machine in a position to actuate the said braking means during theperiod of raising and lowering the said platen roll in relation to the said bed as the paper is withdrawn and inserted in the carriage from and to the said bed.

3. In a machine of the class described, a platen roll mounted in a carriage and adapted to be raised and lowered about a hinge pin center, a braking means located in the region of the said hinge pin center, a disk mounted on the shaft of the said platen roller and extending to the region of the said braking means, the said braking means adapted to clamp the said disks during the period of raising and lowering of the said platen roll about its hinge pin support.

4. In amachine of the class described, an impression bed, an impression carriage operating over and in conjunction with the said bed, a platen roller adapted to be raised and lowered in relation to the said bed, a disk member fixed on the shaft of the said platen roll, and forming a part of a braking mechanism for preventing the revolution of the roller in the act of placing the paper on the bed, the

said disk much larger in diameter than the diameter of the said platen roll and with a braking mechanism adapted to clamp the marginal region of the said disk.

5. In a machine of the class described, a platen roller adapted to be raised and lowered in the application of the paper to a hectograph surface, a disk of larger diameter than the said platen roll mounted on the shaft of the said platen roll and braking means adapted to clamp both sides of the said disk and in the marginal region thereof to prevent the rotation of the platen roll as the same is raised and lowered in applying the paper to the said hectograph surface.

Signed at Chicago, in the county of Cook and State of Illinois, this 28th day of February, 1928.

WILLIAM ERASTUS WILLIAMS. 

